The Magellan and Pioneer Venus Orbiter radiometric tracking data sets have been combined to produce a 60th degree and order spherical harmonic gravity field.

x-band↗

NASA NTRS1993

Beyo9nd Aerobraking: Designing the Magellan Global Gravity Experiment

The orbit of the Magellan spacecraft will be circularized by aerobraking by the end of August, 1993. The nearly circular orbit is necessary to obtain meaningful gravity science at high latitudes.

Magellan spacecraft aerobraking elliptical orbit V↗

NASA NTRS1972

Moon model - An offset core.

The lunar model proposed helps to account for the offset of the center of gravity from the center of the optical figure, the moments of inertia of the Moon, the 'mascons,' the localization of the maria basins on the near side of the Moon, the igneous nature of rocks, and the remanent magnetism. In the proposed model the Moon has a core whose center is offset from the center of the outside spheroid towards the earth. Such a core will be formed if the Moon were entirely molten at some time in its past, and on solidification was synchronous with the earth.

Ransford, G.↗

NASA NTRS1971

A surface-layer representation of the lunar gravitational field

Dynamic derivation of surface layer representation of lunar gravitational field from Doppler observations on polar and equatorial lunar orbiters

Buechler, G.↗